嗨，我想使用回形针和imagemagick裁剪照片。 裁剪照片时遇到一些错误。 以下是错误堆栈：
?[32mCommand?[0m :: convert "C:/Users/Anand/AppData/Local/Temp/120120924-3568-tx 2bxy.jpg[0]" -crop 103x103+0+0 -auto-orient "C:/Users/Anand/AppData/Local/Temp/1 20120924-3568-tx2bxy20120924-3568-16dij9c" ?[32mCommand?[0m :: file -b --mime "C:/Users/Anand/AppData/Local/Temp/120120924- 3568-tx2bxy20120924-3568-16dij9c" [paperclip] Error while determining content type: Cocaine::CommandNotFoundError ?[32mCommand?[0m :: identify -format %wx%h "C:/Users/Anand/AppData/Local/Temp/12 0120924-3568-tx2bxy.jpg[0]" ?[1m?[36m (0.0ms)?[0m ?[1mrollback transaction?[0m Completed 500 Internal Server Error in 145552ms NoMethodError (undefined method `exitstatus' for nil:NilClass): app/models/user.rb:14:in `reprocess_photo' app/models/user.rb:14:in `reprocess_photo' app/models/user.rb:14:in `reprocess_photo' app/models/user.rb:14:in `reprocess_photo' app/models/user.rb:14:in `reprocess_photo' app/models/user.rb:14:in `reprocess_photo' app/models/user.rb:14:in `reprocess_photo' app/controllers/users_controller.rb:67:in `block in update' app/controllers/users_controller.rb:66:in `update' Rendered E:/Ruby192/lib/ruby/gems/1.9.1/gems/actionpack-3.2.8/lib/action_dispa tch/middleware/templates/rescues/_trace.erb (10.0ms) Rendered E:/Ruby192/lib/ruby/gems/1.9.1/gems/actionpack-3.2.8/lib/action_dispa tch/middleware/templates/rescues/_request_and_response.erb (1.0ms) Rendered E:/Ruby192/lib/ruby/gems/1.9.1/gems/actionpack-3.2.8/lib/action_dispa tch/middleware/templates/rescues/diagnostics.erb within rescues/layout (51.0ms) Exiting model / user.rb文件：
class User < ActiveRecord::Base attr_accessible :name,:photo,:crop_x,:crop_y,:crop_w,:crop_h has_attached_file :photo,:styles => {:small=>"100x100#",:large=>"500x500>"},:processors => [:cropper] attr_accessor :crop_x,:crop_y,:crop_w,:crop_h after_update :reprocess_photo,:if=>:cropping? def cropping? !crop_x.blank? && !crop_y.blank? && !crop_w.blank? && !crop_h.blank? end private def reprocess_photo photo.reprocess! end end
我的lib / paperclip_processros / cropper.rb
module Paperclip class Cropper < Thumbnail def transformation_command if crop_command #this generates command : #this is right #convert "C:/Users/Anand/AppData/Local/Temp/1.jpg[0]" -crop 102x102+0+0 -auto-orient "C:/Users/Anand/AppData/Local/Temp/120120924-2336-qbzroo20120924-2336-1jqbiiv.jpg" crop_command + super.first.sub(/ -crop \S+/, '') else super end end def crop_command target = @attachment.instance if target.cropping? " -crop #{target.crop_w}x#{target.crop_h}+#{target.crop_x}+#{target.crop_y} " end end end end
我的configuration/环境/ dev.rb
Paperclip.options[:swallow_stderr] = false Paperclip.options[:command_path] = "C:/Program Files/ImageMagick-6.7.9-Q16/"
在裁剪之后更新照片时，它会进入循环。 什么可能是解决scheme？
我敢肯定，你遇到了同样的问题，我最初有，重新处理！ 方法是保存ActiveRecord的父，然后触发after_update回调，这导致你的reprocess_photo方法被再次调用。 最终的结果是一个有些递归的循环，直到你的机器耗尽可分配的内存才会停止。
这个简单的解决方法是添加一个布尔属性称为处理，这将允许您确定我们是否已经重新处理图像。
attr_accessor :processing
然后改变你的reprocess_photo返回，如果图像已被处理。
def reprocess_photo # don't crop if the user isn't updating the photo # ...or if the photo is already being processed return unless (cropping? && !processing) self.processing = true photo.reprocess! self.processing = false end
尝试改变
Paperclip.options[:command_path] = "C:/Program Files/ImageMagick-6.7.9-Q16/"
至
Paperclip.options[:command_path] = 'C:/PROGRA~1/IMAGEM~1.0-Q'
似乎像图像 – Magick没有被发现